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Share-Based Compensation (RSU Activity) (Details) - RSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Estimated Forfeiture Rate Non Officers 9.35%    
Period of straight-line expense, 2015 RSU's 3 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 days    
RSUs (Number of Shares):      
Nonvested at beginning of period 2,966    
Vested (1,428) (1,337) (1,063)
Forfeited and expired (528)    
Granted 913    
Nonvested at end of period 1,923 2,966  
Vested and expected to vest at end of period 1,782    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 10    
Weighted Average Grant Date Fair Value (in dollars per share):      
Nonvested at beginning of period $ 11.02    
Vested 11.05    
Forfeited and expired 10.95    
Granted 10.55    
Nonvested at end of period 10.80 $ 11.02  
Vested and expected to vest at end of period $ 10.79    
Nonvested at end of period, weighted average remaining vesting term 1 year 4 months 24 days    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year $ 9